After watching the first part of the new season premiere, something struck me:
After impregnating and having a child by a vending machine, Bender is quite surprised. However, as seen in The Beast with a Billion Backs; he already has a son, that appears, knowing what we now do, to have been conceived and born in a similar fashion.
How can he not know how this works, or more to the point, fail to even realize that it is a thing?
Edit: Realizing that the question is, in its current form, somewhat lacking; I'll amend it:
Is there any observed in-universe reason for his failing to keep track of such an utterly basic element of his own "biology"?